Never! Quite simply, the faster you fly, the quicker you drop out of the sky. I know you are hamstrung over there with a hard 250kt/10,000' limitation, but throughout the descent, if I'm high, I wind the speed up. Try a 737 at 330kts instead of 280- it means often you don't even need speedbrake. you expend so much energy speeding up and in a high drag regime that even with slowing up again, you have gotten down far quicker than if you came down at 280 with speedbrake.
We were given jets to get there quicker! Slow up early, and you should be a turboprop pilot.